OK, so if my dad and my uncle both share 50% of their blood because they get half of their DNA each from their parents and then I get the DNA from my parents, how is my uncle 25% related to me because he got the same amount of DNA as my father?

OK so if my dad and my uncle both share 50 of their blood because they get half of their DNA each from their parents and then I get the DNA from my parents how class=